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Add an api to support the CTA range color square video test pattern as explained in section 3.2.5.3 of the DP CTS specification. This pattern is required for supporting the CTA range for RGB formats. Also rename the existing api igt_fill_cts_framebuffer to igt_fill_cts_color_ramp_framebuffer to highlight the pattern type. changes in v3: - fix compilation warnings by reformatting code changes in v2: - removed redundant pointers - fixed overall formatting issues - Fixed author name Signed-off-by: Maitreyee Rao <maitreye@codeaurora.org> Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com> Acked-by: Petri Latvala <petri.latvala@intel.com>